Once you have found the release you are looking for, simply specify in the pip3 install command. When an invalid version is specified, Pip3 will output an error along with all of the available releases. Install pip in Ubuntu What is a pip Pip can be described as a tool to install the packages of Python.We can download, search, and install many packages using Python Package Index (short for PyPI) and other indexes of the package with pip.The pip is used to install and manage Python software packages.